Level and plumb



A Jan. l, 1929.

G. E. ERICKSON E' AL LEVEL AND PLUMB Filed ooty, 192e Lla atto/ungPatented Jan. 1, 1929.

unirsi) sursis rarest orifice.

i GUsTAvE E. nafro'xsomor MINNDAroLrs, AND SELMER A. KRATY, vvor s'r.PAUL, MIN- NEsoTA; SAID KRAFTA Ass'rGNoR To vrc'ron'naesfrnnr, or sfr.PAUL, Minna LEVEL AND rLuM-B.

vApplication filed. October 2,1926. Serial No. 133,076. y

Our invention relates to a level and plumb device of the class commonlyused 'in' the building industry vand the 'object is to p rovide animproved device of said kind which is simple and eiiicient andeliminates the use of liquid in glass tubes. i

In the accompanying drawing:

Fig. 1 is a top 4view of the central part of a ylevel stock embodyingour invention.

Fig. 2 is a partly sectional front elevation of Fig. 1.

Fig. 3 is a sectional detail view as on line 3-3 in Fig. 2. n

Fig. 4 is an end elevation of our device on Y line 4-4 in Fig. 2.

Fig. 5 is an enlarged sectional detail of the pivot mounting of ourdevice on line 5-5 in Fig. 3.

Fig. 6 is a sectional elevation on line 6-6 in Figs. 1 and 4 showingmainly the* brake or stop construction of our device. p

Referring to the drawing' by reference numerals, 10 designates the levelstockusually consisting of an elongated straight bar of suit-ablewoodand laid with its lower edge 10b on timbers either vertically orhorizontally during construction work. Y

" 11 is a deep pocket or recess in the center of the stock and extendingnearly to the bot- A tom edge 10bthereof, said pocket adapted t0 receivein its upper part a metal frame 12 with end flanges 12f adapted to restand be secured by screws 13 vin depressions in the top edge of the blockso that the entire top p of the frame 12 is flush with said top edge 10,of the block (see Figs. 1 and 2). 12EL are side ears at the upper partof frame 12 preferably made flush with the sides of the block 10 andeach having a window opening 14, and

4o another window opening 15 is provided in the upper face ofthe frame12. 12b are side walls of the frame formedfintegral with the ears 12aband mainly below thelatter, said walls 12h being parallel and connectedby end walls 12C. 16 is an inverted U-shaped ma# chined slot in frame 12under its top and longitudinally thereof, to slidably receive and pretain glass strips 17 in said U-formation and closing the windowopenings 14. Y

5 0 Between the lower framemembers12br we mount a circular disc-wheelcomprising a web 18. a hollow integral rim 18A with suitable graduationson its opposite sides and correspondinggraduations on its periphery, theformer readablethrough the `side windows 14 at a so-called hairline-Hland thel latter readable at av like line-H in thetop' window 15. Thedisc wheel is mounted'on a pivot pin 19 suitably fixed inl the hub andits opposite ends'pointed as 19A, each point engaging in a concavedbearing member 20 ofsuitable hard material and imbeddedinV a hard rubberor other slightly yieldable material 21 Vin the form of a thimblefrictionallyretained concentrically in the threaded end of a nut 22.These nuts are ofcourse arranged to be screwed :into horizontallyregistering threaded holes located in the lower central part of thewalls 12b and so located and adjusted that Athe disc-wheel graduationsare 18 must necessarily be very delicately bal- 7o yexposed in theWindows 14 and15. The wheel anced so as to be freely rotatable, itshollow l rim containinga suitable'heavy materialy -23 at one side of itscenter only so that whenV the block 10 is absolutely level or verticalYthe reading at the hairline in all of the windows will be O.. Anydeviation from vertical or 'i horizontal position of the level will ofcourse f Y be indicated inv degrees at the hairlines H, the weightedpart of the disc remaining below center. i

24 is a leaf-spring brake suitable ixed at wheel always one end to theunder side of the upper wall i `or flange 12f (see Figs.,1 and 6) itsfree end 24a normally close to the .perimeter of the disc wheel.VIntermediate the ends of the spring a push button is fixed to it andpro-V jectsupwardly'through an aperture 26 kin course engaged andprevented from turning.

This feature is particularly useful for ex.-

ample. when a carpenter uses the improved level at arms length`r overhis head or in places where the light is poor and reading the angle sesmust be done after movingthe'level from l the timber on which it hasbeen used.

In Fig. 5 is clearly shown that the pointed ends 19A of the pivots19 areengaged at the points only and the concave bearing'end 22A of the nut 22is shallow so thatthe pointed or vangular ends of the pivots donot-touch the bearing. Thus in case the'level is accidentally dropped orjarred suddenly the '4 pivot pinsare less likely to become broken andthe strain on the points is relieved by the i a yieldablemateia'li:

We claim:y i v 4 lIn. a. level comprising` an elongated bar With acentral aperture and4 a longitudinally flanged indicator frame with, itsflanged parts secured flush With" one edge of the bar, a ro- JVparylevelindieatormounted in sairliyfrainey and the said bar having horizontaland ver-v tical sight ape,1"mres; Said: rotary ndieaoix;

consisting ofjagdise Wheel Withfa central disc and an` integral*eireular hollowring quad- Triangular in crosslseetienyand a- Weightsecure-d infsaidf ring-'tooneside-edi its axis, saidl ring provlde'dwith Correspondlnlg, indicia ,ony its sides and periphery and saidWindows having a radial stationary Ina-rk each outwardly of oneof saidindicating faces of the dise, and a f brake for holding saiddisc Wheel',said brake 20 f. j

comprising a leaf spring Vwith one end liXed in the frame remote fromJche ldise Wheel andv v its free end, normally in. proximinj t'o theperiphery of' the' disc Wheel", a' pus 1. l`)1'1lt0n fixedgon saidspring and laccessible eXterio-rly 25" SELMERLA.

